The non-executive chairman of Computacenter has bought new shares in the company.Greg Lock purchased 41,500 shares for an individual price of 768.8p, spending a total of £319,052.As a result, Lock, who is also the chairman of Kofax, holds 390,922 shares in the IT group, which represent 0.32% of its issued share capital.The company said in April its first quarter saw a decline in revenues by 2% to £715.9m as it took a large amount of new business in the UK."While peaks and troughs in our business performance come and go, we believe the strategy we have laid out will enable us to continue the above market performance growth in our Services business for some time to come," it said at the time.Top Director BuysComputacenter (CCC) Director name: Mr Greg LockAmount purchased: 41,500 @ 768.80p Value: £319,052Barclays (BARC) Director name: Mr Antony JenkinsAmount purchased: 90,614 @ 262.10p Value: £237,499Barclays (BARC) Director name: Mr Tushar MorzariaAmount purchased: 71,537 @ 262.10p Value: £187,498Lloyds Banking Group (LLOY) Director name: Mr Simon HenryAmount purchased: 100,000 @ 85.46p Value: £85,460Caledonia Investments (CLDN) Director name: Mr David StewartAmount purchased: 3,460 @ 2,443.75p Value: £84,554Speedy Hire (SDY) Director name: Mr Jan G AstrandAmount purchased: 150,000 @ 47.50p Value: £71,250GlaxoSmithKline (GSK) Director name: Sir Sir Deryck MaughanAmount purchased: 2,720 @ 1,343.14p Value: £36,533Velox3 (VLOX) Director name: Mr Rogier Willem Smit Amount purchased: 1,579,808 @ 3.50p Value: £55,293GlaxoSmithKline (GSK) Director name: Ms Lynn ElsenhansAmount purchased: 2,142 @ 1,343.14p Value: £28,770Velox3 (VLOX) Director name: Mr David Carr Mathewson Amount purchased: 1,247,618 @ 3.50p Value: £43,667Top Director SellsConsort Medical (CSRT) Director name: Mr Jonathan GlennAmount sold: 35,410 @ 912.75p Value: £323,205Stagecoach Group (SGC) Director name: Mr Martin Andrew GriffithsAmount sold: 76,483 @ 407.22p Value: £311,454Stagecoach Group (SGC) Director name: Mr Brian SouterAmount sold: 55,762 @ 407.22p Value: £227,074Signet Jewelers Ltd. (SIG) Director name: Ms Marianne Miller ParrsAmount sold: 525 @ 8,196.95p Value: £43,034Stagecoach Group (SGC) Director name: Mr Ross PatersonAmount sold: 13,142 @ 407.22p Value: £53,517China Nonferrous Gold Limited (DI) (CNG) Director name: Mr Abuali IsmatovAmount sold: 140,000 @ 25.89p Value: £36,246